How do I convert Tryptophan (CSF) from ng/mL to nmol/L?

nmol/L = ng/mL × 4.897. In the other direction: ng/mL = nmol/L × 0.2042.

Which units are used for Tryptophan (CSF)?

Common units are ng/mL, nmol/L.

Urine & CSF

Tryptophan in cerebrospinal fluid (precursor of serotonin and kynurenine)

Also known as: Tryptophan (Liquor)

Enter a value in any unit and all other units fill in.

ng/mL nmol/L

10 nmol/L = 2.04 ng/mL

nmol/L	nmol/L = ng/mL × 4.897	ng/mL = nmol/L × 0.2042

Tryptophan (CSF) is reported in ng/mL or nmol/L. The page converts between the units only.

nmol/L × 0.2042 = ng/mL (exact factor 0.2042).
CSF values are only meaningful together with a blood sample taken at the same time; no established reference range is listed here.

—

Source: PubChem: L-Tryptophan · Last reviewed: 2026-10-19

Note from the source: No established reference range; the page converts units only. Mass-to-amount conversion uses a molar mass of 204.22 g/mol.